Wheatstone bridges and some accessory apparatus for resistance thermometry

Wheatstone bridges and some accessory apparatus for resistance thermometry

Year: 1917

Bridges specially adapted for thermometry work are described. Instead of the usual slide wire the smaller steps are obtained by the use of shunts. The scheme of connections of the bridge is shown in the Fig. The two ratio coils are 250 ohms each and are connected by a short wire which is used in adjusting them to equality. The other ends of the coils terminate in long bars which may be connected by means of plugs to the contact blocks of the 1-ohm and 0.1-ohm decades. The 10-ohm coils are connected to binding-post blocks and the desired number of coils are introduced into the circuit by making connections to%2